The Arex Delta M OR is a 9mm striker-fired semi-automatic pistol with a 4-inch threaded barrel and a black finish. It is built optics-ready with mounting plates for red dot sights and includes ambidextrous magazine and slide controls. The frame accepts interchangeable backstraps, letting shooters adjust the grip to fit their hand, and the threaded muzzle opens up compensator and suppressor options for the same platform. 
 

Key Specifications 

• Brand: Arex 
• Model: Delta M OR 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 15+1 
• Barrel Length: 4 in 
• Finish: Black 
   

Detailed Features 

• Optics-ready slide with plates for mounting a red dot sight 
• Factory threaded 4-inch barrel for compatible muzzle devices 
• Ambidextrous magazine release and slide release 
• Interchangeable frame and backstrap inserts for a more consistent fit 
• Striker-fired design suited to everyday carry use

The Delta M OR gets consistent praise for its ergonomics. Owners like the ambidextrous controls and the interchangeable backstraps, which let both left and right-handed shooters settle into a natural grip. The optics-ready slide is a common reason buyers pick this model, since it skips the extra step of sending a slide out for milling.

Reliability comments are largely positive, with most owners reporting smooth function after an initial break-in period. A handful mention the factory sights are basic and get swapped out once an optic goes on, and some note the trigger reset is not as crisp as pricier striker guns.

As a carry and range pistol, the threaded barrel is a draw for owners planning to add a compensator down the line. Holster fit can be a bit more limited than for more established brands, since aftermarket support is still building out.